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33 lines
2.3 KiB
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33 lines
2.3 KiB
HTML
<article id="wikiArticle">
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<div></div>
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<h2 id="错误信息">错误信息</h2>
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<pre><code class="language-javascript">RangeError: {0} is not a valid code point (Firefox)
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RangeError: Invalid code point {0} (Chrome)
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</code></pre>
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<h2 id="错误类型">错误类型</h2>
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<p><a href="Reference/Global_Objects/RangeError" title="RangeError对象标明一个错误，当一个值不在其所允许的范围或者集合中。"><code>RangeError</code></a></p>
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<h2 id="什么地方出错了？">什么地方出错了？</h2>
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<p> <a href="Reference/Global_Objects/String/fromCodePoint" title="String.fromCodePoint() 静态方法返回使用指定的代码点序列创建的字符串。"><code>String.fromCodePoint()</code></a> 这个方法只能接受有效的码位（code point） 。</p>
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<p>码位（ <a class="external" href="https://en.wikipedia.org/wiki/Code_point" rel="noopener">code point</a>）是组成码空间（或代码页）的数值，范围是 0 到 0x10FFFF。</p>
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<p> <a href="Reference/Global_Objects/NaN" title="全局属性 NaN 的值表示不是一个数字（Not-A-Number）。"><code>NaN</code></a>，负整数（-1），非整数（3.14），或编号大于0x10FFFF (1114111) 的字符，无法使用该方法。</p>
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<h2 id="范例">范例</h2>
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<h3 id="无效的例子">无效的例子</h3>
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<pre><code class="language-js example-bad">String.fromCodePoint('_'); // RangeError
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String.fromCodePoint(Infinity); // RangeError
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String.fromCodePoint(-1); // RangeError
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String.fromCodePoint(3.14); // RangeError
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String.fromCodePoint(3e-2); // RangeError
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String.fromCodePoint(NaN); // RangeError</code></pre>
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<h3 id="有效的例子">有效的例子</h3>
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<pre><code class="language-js example-good">String.fromCodePoint(42); // "*"
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String.fromCodePoint(65, 90); // "AZ"
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String.fromCodePoint(0x404); // "\u0404"
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String.fromCodePoint(0x2F804); // "\uD87E\uDC04"
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String.fromCodePoint(194564); // "\uD87E\uDC04"
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String.fromCodePoint(0x1D306, 0x61, 0x1D307) // "\uD834\uDF06a\uD834\uDF07"
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</code></pre>
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<h2 id="相关链接">相关链接</h2>
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<ul>
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<li><a href="Reference/Global_Objects/String/fromCodePoint" title="String.fromCodePoint() 静态方法返回使用指定的代码点序列创建的字符串。"><code>String.fromCodePoint()</code></a></li>
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</ul>
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</article> |